| 摘要 |
<p>A ball seat valve employed in a downhole tool string includes a split-ring baffle that is configured to radially expand and then to radially contract to catch a dropped ball or other plug device. One configuration allows the baffle to be relatively radially expanded in a first position, but to be longitudinally moveable to a radially contracted position, in which the baffle is configured to receive and catch a dropped ball or other plug device.</p> |
